import 'package:flutter/material.dart';
import 'package:nft_shop/net/service_repository.dart';
import 'package:nft_shop/res/constant.dart';
import 'package:nft_shop/sift/view/sift_list_item_widget.dart';
import 'package:nft_shop/widgets/status_view.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

class UserInfoList extends StatefulWidget {
  int? index;
  String? ID;
  UserInfoList({Key? key,this.index,this.ID}) : super(key: key);

  @override
  _UserInfoListState createState() => _UserInfoListState();
}

class _UserInfoListState extends State<UserInfoList> {
  /// 分页第一页页码
  static const int pageNumFirst = 1;

  /// 当前第几页
  int currentPageNum = pageNumFirst;

  /// 分页条目数量
  int pageSize = 20;

  /// 页面数据
  List list = [];

  ///状态
  int _status = LoadStatusType.loading;

  int get status => _status;

  set status(int value) {
    _status = value;
    setState(() {});
  }

  ///刷新组件
  RefreshController refreshController =
  RefreshController(initialRefresh: false);



  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    refresh();
  }
//获取数据
  Future<List> loadData({int? pageNum}) async {
    return await ServiceRepository.goodsSpecialList(page: pageNum!, pageSize:pageSize, isHot:0, type:widget.index!,ID:widget.ID);
  }

  /// 下拉刷新
  ///
  /// [init] 是否是第一次加载
  /// true:  Error时,需要跳转页面
  /// false: Error时,不需要跳转页面,直接给出提示
  Future<List?> refresh({bool init = false}) async {
    try {
      currentPageNum = pageNumFirst;
      var data = await loadData(pageNum: pageNumFirst);
      print("数组个数--${data.length}");
      if (data.isEmpty) {
        refreshController.refreshCompleted(resetFooterState: true);
        list.clear();
        status = LoadStatusType.empty;
      } else {
        list.clear();
        list.addAll(data);
        refreshController.refreshCompleted();
        // 小于分页的数量,禁止上拉加载更多
        if (data.length < pageSize) {
          refreshController.loadNoData();
        } else {
          //防止上次上拉加载更多失败,需要重置状态
          refreshController.loadComplete();
        }
        status = LoadStatusType.success;
      }
      return data;
    } catch (e, s) {
      /// 页面已经加载了数据,如果刷新报错,不应该直接跳转错误页面
      /// 而是显示之前的页面数据.给出错误提示
      if (init) list.clear();
      refreshController.refreshFailed();
      status = LoadStatusType.empty;
      // setError(e, s);
      return null;
    }
  }

  /// 上拉加载更多
  Future<List?> loadMore() async {
    try {
      var data = await loadData(pageNum: currentPageNum);
      if (data.isEmpty) {
        currentPageNum--;
        refreshController.loadNoData();
      } else {
        list.addAll(data);
        if (data.length < pageSize) {
          refreshController.loadNoData();
        } else {
          refreshController.loadComplete();
        }
        setState(() {});
      }
      return data;
    } catch (e, s) {
      currentPageNum--;
      refreshController.loadFailed();
      return null;
    }
  }



  @override
  Widget build(BuildContext context) {
    if(status != LoadStatusType.success){
      return StatusViews(status);
    }

    return ListView.builder(
      shrinkWrap: true,
      itemCount:list.length,
      physics: const NeverScrollableScrollPhysics(),
      itemBuilder: (_, index) {
        return SiftListItemWidget(model:list[index]);
      },);
  }


}
